diff -r 20f18e5e8bfc Modules/_sre.c
--- a/Modules/_sre.c	Sat Jan 07 00:08:29 2017 +0100
+++ b/Modules/_sre.c	Sat Jan 07 14:01:29 2017 +0200
@@ -551,55 +551,25 @@ sre_search(SRE_STATE* state, SRE_CODE* p
     return sre_ucs4_search(state, pattern);
 }
 
-static PyObject *
-fix_string_param(PyObject *string, PyObject *string2, const char *oldname)
-{
-    if (string2 != NULL) {
-        if (string != NULL) {
-            PyErr_Format(PyExc_TypeError,
-                         "Argument given by name ('%s') and position (1)",
-                         oldname);
-            return NULL;
-        }
-        if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
-                             "The '%s' keyword parameter name is deprecated.  "
-                             "Use 'string' instead.", oldname) < 0)
-            return NULL;
-        return string2;
-    }
-    if (string == NULL) {
-        PyErr_SetString(PyExc_TypeError,
-                        "Required argument 'string' (pos 1) not found");
-        return NULL;
-    }
-    return string;
-}
-
 /*[clinic input]
 _sre.SRE_Pattern.match
 
-    string: object = NULL
+    string: object
     pos: Py_ssize_t = 0
     endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
-    *
-    pattern: object = NULL
 
 Matches zero or more characters at the beginning of the string.
 [clinic start generated code]*/
 
 static PyObject *
 _sre_SRE_Pattern_match_impl(PatternObject *self, PyObject *string,
-                            Py_ssize_t pos, Py_ssize_t endpos,
-                            PyObject *pattern)
-/*[clinic end generated code: output=74b4b1da3bb2d84e input=3d079aa99979b81d]*/
+                            Py_ssize_t pos, Py_ssize_t endpos)
+/*[clinic end generated code: output=ea2d838888510661 input=a2ba191647abebe5]*/
 {
     SRE_STATE state;
     Py_ssize_t status;
     PyObject *match;
 
-    string = fix_string_param(string, pattern, "pattern");
-    if (!string)
-        return NULL;
     if (!state_init(&state, (PatternObject *)self, string, pos, endpos))
         return NULL;
 
@@ -623,29 +593,22 @@ static PyObject *
 /*[clinic input]
 _sre.SRE_Pattern.fullmatch
 
-    string: object = NULL
+    string: object
     pos: Py_ssize_t = 0
     endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
-    *
-    pattern: object = NULL
 
 Matches against all of the string
 [clinic start generated code]*/
 
 static PyObject *
 _sre_SRE_Pattern_fullmatch_impl(PatternObject *self, PyObject *string,
-                                Py_ssize_t pos, Py_ssize_t endpos,
-                                PyObject *pattern)
-/*[clinic end generated code: output=1c98bc5da744ea94 input=d4228606cc12580f]*/
+                                Py_ssize_t pos, Py_ssize_t endpos)
+/*[clinic end generated code: output=5833c47782a35f4a input=a6f640614aaefceb]*/
 {
     SRE_STATE state;
     Py_ssize_t status;
     PyObject *match;
 
-    string = fix_string_param(string, pattern, "pattern");
-    if (!string)
-        return NULL;
-
     if (!state_init(&state, self, string, pos, endpos))
         return NULL;
 
@@ -669,11 +632,9 @@ static PyObject *
 /*[clinic input]
 _sre.SRE_Pattern.search
 
-    string: object = NULL
+    string: object
     pos: Py_ssize_t = 0
     endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
-    *
-    pattern: object = NULL
 
 Scan through string looking for a match, and return a corresponding match object instance.
 
@@ -682,18 +643,13 @@ Return None if no position in the string
 
 static PyObject *
 _sre_SRE_Pattern_search_impl(PatternObject *self, PyObject *string,
-                             Py_ssize_t pos, Py_ssize_t endpos,
-                             PyObject *pattern)
-/*[clinic end generated code: output=3839394a18e5ea4f input=dab42720f4be3a4b]*/
+                             Py_ssize_t pos, Py_ssize_t endpos)
+/*[clinic end generated code: output=25f302a644e951e8 input=4ae5cb7dc38fed1b]*/
 {
     SRE_STATE state;
     Py_ssize_t status;
     PyObject *match;
 
-    string = fix_string_param(string, pattern, "pattern");
-    if (!string)
-        return NULL;
-
     if (!state_init(&state, self, string, pos, endpos))
         return NULL;
 
@@ -762,30 +718,23 @@ deepcopy(PyObject** object, PyObject* me
 /*[clinic input]
 _sre.SRE_Pattern.findall
 
-    string: object = NULL
+    string: object
     pos: Py_ssize_t = 0
     endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
-    *
-    source: object = NULL
 
 Return a list of all non-overlapping matches of pattern in string.
 [clinic start generated code]*/
 
 static PyObject *
 _sre_SRE_Pattern_findall_impl(PatternObject *self, PyObject *string,
-                              Py_ssize_t pos, Py_ssize_t endpos,
-                              PyObject *source)
-/*[clinic end generated code: output=51295498b300639d input=df688355c056b9de]*/
+                              Py_ssize_t pos, Py_ssize_t endpos)
+/*[clinic end generated code: output=f4966baceea60aca input=5b6a4ee799741563]*/
 {
     SRE_STATE state;
     PyObject* list;
     Py_ssize_t status;
     Py_ssize_t i, b, e;
 
-    string = fix_string_param(string, source, "source");
-    if (!string)
-        return NULL;
-
     if (!state_init(&state, self, string, pos, endpos))
         return NULL;
 
@@ -922,18 +871,16 @@ static PyObject *
 /*[clinic input]
 _sre.SRE_Pattern.split
 
-    string: object = NULL
+    string: object
     maxsplit: Py_ssize_t = 0
-    *
-    source: object = NULL
 
 Split string by the occurrences of pattern.
 [clinic start generated code]*/
 
 static PyObject *
 _sre_SRE_Pattern_split_impl(PatternObject *self, PyObject *string,
-                            Py_ssize_t maxsplit, PyObject *source)
-/*[clinic end generated code: output=20bac2ff55b9f84c input=41e0b2e35e599d7b]*/
+                            Py_ssize_t maxsplit)
+/*[clinic end generated code: output=7ac66f381c45e0be input=1eeeb10dafc9947a]*/
 {
     SRE_STATE state;
     PyObject* list;
@@ -943,10 +890,6 @@ static PyObject *
     Py_ssize_t i;
     void* last;
 
-    string = fix_string_param(string, source, "source");
-    if (!string)
-        return NULL;
-
     assert(self->codesize != 0);
     if (self->code[0] != SRE_OP_INFO || self->code[3] == 0) {
         if (self->code[0] == SRE_OP_INFO && self->code[4] == 0) {
diff -r 20f18e5e8bfc Modules/clinic/_sre.c.h
--- a/Modules/clinic/_sre.c.h	Sat Jan 07 00:08:29 2017 +0100
+++ b/Modules/clinic/_sre.c.h	Sat Jan 07 14:01:29 2017 +0200
@@ -63,7 +63,7 @@ exit:
 }
 
 PyDoc_STRVAR(_sre_SRE_Pattern_match__doc__,
-"match($self, /, string=None, pos=0, endpos=sys.maxsize, *, pattern=None)\n"
+"match($self, /, string, pos=0, endpos=sys.maxsize)\n"
 "--\n"
 "\n"
 "Matches zero or more characters at the beginning of the string.");
@@ -73,33 +73,30 @@ PyDoc_STRVAR(_sre_SRE_Pattern_match__doc
 
 static PyObject *
 _sre_SRE_Pattern_match_impl(PatternObject *self, PyObject *string,
-                            Py_ssize_t pos, Py_ssize_t endpos,
-                            PyObject *pattern);
+                            Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
 _sre_SRE_Pattern_match(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
-    static _PyArg_Parser _parser = {"|Onn$O:match", _keywords, 0};
-    PyObject *string = NULL;
+    static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
+    static _PyArg_Parser _parser = {"O|nn:match", _keywords, 0};
+    PyObject *string;
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
-    PyObject *pattern = NULL;
 
     if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
-        &string, &pos, &endpos, &pattern)) {
+        &string, &pos, &endpos)) {
         goto exit;
     }
-    return_value = _sre_SRE_Pattern_match_impl(self, string, pos, endpos, pattern);
+    return_value = _sre_SRE_Pattern_match_impl(self, string, pos, endpos);
 
 exit:
     return return_value;
 }
 
 PyDoc_STRVAR(_sre_SRE_Pattern_fullmatch__doc__,
-"fullmatch($self, /, string=None, pos=0, endpos=sys.maxsize, *,\n"
-"          pattern=None)\n"
+"fullmatch($self, /, string, pos=0, endpos=sys.maxsize)\n"
 "--\n"
 "\n"
 "Matches against all of the string");
@@ -109,33 +106,30 @@ PyDoc_STRVAR(_sre_SRE_Pattern_fullmatch_
 
 static PyObject *
 _sre_SRE_Pattern_fullmatch_impl(PatternObject *self, PyObject *string,
-                                Py_ssize_t pos, Py_ssize_t endpos,
-                                PyObject *pattern);
+                                Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
 _sre_SRE_Pattern_fullmatch(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
-    static _PyArg_Parser _parser = {"|Onn$O:fullmatch", _keywords, 0};
-    PyObject *string = NULL;
+    static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
+    static _PyArg_Parser _parser = {"O|nn:fullmatch", _keywords, 0};
+    PyObject *string;
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
-    PyObject *pattern = NULL;
 
     if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
-        &string, &pos, &endpos, &pattern)) {
+        &string, &pos, &endpos)) {
         goto exit;
     }
-    return_value = _sre_SRE_Pattern_fullmatch_impl(self, string, pos, endpos, pattern);
+    return_value = _sre_SRE_Pattern_fullmatch_impl(self, string, pos, endpos);
 
 exit:
     return return_value;
 }
 
 PyDoc_STRVAR(_sre_SRE_Pattern_search__doc__,
-"search($self, /, string=None, pos=0, endpos=sys.maxsize, *,\n"
-"       pattern=None)\n"
+"search($self, /, string, pos=0, endpos=sys.maxsize)\n"
 "--\n"
 "\n"
 "Scan through string looking for a match, and return a corresponding match object instance.\n"
@@ -147,33 +141,30 @@ PyDoc_STRVAR(_sre_SRE_Pattern_search__do
 
 static PyObject *
 _sre_SRE_Pattern_search_impl(PatternObject *self, PyObject *string,
-                             Py_ssize_t pos, Py_ssize_t endpos,
-                             PyObject *pattern);
+                             Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
 _sre_SRE_Pattern_search(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
-    static _PyArg_Parser _parser = {"|Onn$O:search", _keywords, 0};
-    PyObject *string = NULL;
+    static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
+    static _PyArg_Parser _parser = {"O|nn:search", _keywords, 0};
+    PyObject *string;
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
-    PyObject *pattern = NULL;
 
     if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
-        &string, &pos, &endpos, &pattern)) {
+        &string, &pos, &endpos)) {
         goto exit;
     }
-    return_value = _sre_SRE_Pattern_search_impl(self, string, pos, endpos, pattern);
+    return_value = _sre_SRE_Pattern_search_impl(self, string, pos, endpos);
 
 exit:
     return return_value;
 }
 
 PyDoc_STRVAR(_sre_SRE_Pattern_findall__doc__,
-"findall($self, /, string=None, pos=0, endpos=sys.maxsize, *,\n"
-"        source=None)\n"
+"findall($self, /, string, pos=0, endpos=sys.maxsize)\n"
 "--\n"
 "\n"
 "Return a list of all non-overlapping matches of pattern in string.");
@@ -183,25 +174,23 @@ PyDoc_STRVAR(_sre_SRE_Pattern_findall__d
 
 static PyObject *
 _sre_SRE_Pattern_findall_impl(PatternObject *self, PyObject *string,
-                              Py_ssize_t pos, Py_ssize_t endpos,
-                              PyObject *source);
+                              Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
 _sre_SRE_Pattern_findall(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static const char * const _keywords[] = {"string", "pos", "endpos", "source", NULL};
-    static _PyArg_Parser _parser = {"|Onn$O:findall", _keywords, 0};
-    PyObject *string = NULL;
+    static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
+    static _PyArg_Parser _parser = {"O|nn:findall", _keywords, 0};
+    PyObject *string;
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
-    PyObject *source = NULL;
 
     if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
-        &string, &pos, &endpos, &source)) {
+        &string, &pos, &endpos)) {
         goto exit;
     }
-    return_value = _sre_SRE_Pattern_findall_impl(self, string, pos, endpos, source);
+    return_value = _sre_SRE_Pattern_findall_impl(self, string, pos, endpos);
 
 exit:
     return return_value;
@@ -275,7 +264,7 @@ exit:
 }
 
 PyDoc_STRVAR(_sre_SRE_Pattern_split__doc__,
-"split($self, /, string=None, maxsplit=0, *, source=None)\n"
+"split($self, /, string, maxsplit=0)\n"
 "--\n"
 "\n"
 "Split string by the occurrences of pattern.");
@@ -285,23 +274,22 @@ PyDoc_STRVAR(_sre_SRE_Pattern_split__doc
 
 static PyObject *
 _sre_SRE_Pattern_split_impl(PatternObject *self, PyObject *string,
-                            Py_ssize_t maxsplit, PyObject *source);
+                            Py_ssize_t maxsplit);
 
 static PyObject *
 _sre_SRE_Pattern_split(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static const char * const _keywords[] = {"string", "maxsplit", "source", NULL};
-    static _PyArg_Parser _parser = {"|On$O:split", _keywords, 0};
-    PyObject *string = NULL;
+    static const char * const _keywords[] = {"string", "maxsplit", NULL};
+    static _PyArg_Parser _parser = {"O|n:split", _keywords, 0};
+    PyObject *string;
     Py_ssize_t maxsplit = 0;
-    PyObject *source = NULL;
 
     if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
-        &string, &maxsplit, &source)) {
+        &string, &maxsplit)) {
         goto exit;
     }
-    return_value = _sre_SRE_Pattern_split_impl(self, string, maxsplit, source);
+    return_value = _sre_SRE_Pattern_split_impl(self, string, maxsplit);
 
 exit:
     return return_value;
@@ -728,4 +716,4 @@ static PyObject *
 {
     return _sre_SRE_Scanner_search_impl(self);
 }
-/*[clinic end generated code: output=b74b16d90f207358 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=586a4132fbe8c6a7 input=a9049054013a1b77]*/